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Hi Ian, long time no see...
So you've moved to the dark side? Welcome...
You can't go wrong with the Sigma 10-20mm. You know my feelings on the f/3.5 vs the f/4-5.6 models so unless you really really need that extra stop it's not worth the extra money.
The Tamron is a decent all-rounder. I'd be tempted to stick to a smaller focal length and go with something like the Sigma 18-125mm OS which is the direct competitor to the Nikon 18-105mm VR and is optically almost identical. That really depends on how long a focal length you want though.
With regards to macro lenses, or long(ish) primes, I'd avoid the Sigma 105mm. The Nikon 105mm is lovely but very pricey. Consider the Tamron 90mm - it's sharper, better built, easier to use and has a less clunky manual focus override than the Sigma. If you can afford the Nikon though...
The only thing I would add to the comments above is about 50mm primes. My advice is to avoid them like the plague. 50mm on an APS-C sensored camera is a really awkward field of view. It's always a bit too long or a bit too short and it's never a happy medium. The Nikon 35mm f/1.8 is the ideal normal prime lens for and APS-C camera as it's pretty close to both definitions of "normal" (geometric and angular) and it's a much more comfortable angle of view.
If you want a longer prime, the older AF-D model 85mm f/1.8 is a nice lens too - very sharp and pretty cheap second hand.
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